1 files changed, 155 insertions, 0 deletions
diff --git a/gfx/vr/VRDisplayPresentation.cpp b/gfx/vr/VRDisplayPresentation.cpp
new file mode 100644
index 0000000000..127225105b
--- /dev/null
+++ b/gfx/vr/VRDisplayPresentation.cpp
@@ -0,0 +1,155 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "VRDisplayPresentation.h"
+#include "mozilla/dom/DocGroup.h"
+#include "mozilla/dom/Document.h"
+#include "mozilla/dom/XRWebGLLayer.h"
+#include "mozilla/Unused.h"
+#include "VRDisplayClient.h"
+#include "VRLayerChild.h"
+
+using namespace mozilla;
+using namespace mozilla::gfx;
+
+VRDisplayPresentation::VRDisplayPresentation(
+    VRDisplayClient* aDisplayClient,
+    const nsTArray<mozilla::dom::VRLayer>& aLayers, uint32_t aGroup)
+    : mDisplayClient(aDisplayClient),
+      mDOMLayers(aLayers.Clone()),
+      mGroup(aGroup) {
+  CreateLayers();
+}
+
+void VRDisplayPresentation::UpdateLayers(
+    const nsTArray<mozilla::dom::VRLayer>& aLayers) {
+  mDOMLayers = aLayers.Clone();
+  CreateLayers();
+}
+
+void VRDisplayPresentation::UpdateXRWebGLLayer(dom::XRWebGLLayer* aLayer) {
+  VRManagerChild* manager = VRManagerChild::Get();
+  if (!manager) {
+    // This should not happen, but let's log it and avoid a crash in case
+    // of regression.
+    NS_WARNING("VRManagerChild::Get returned null!");
+    return;
+  }
+
+  dom::HTMLCanvasElement* canvasElement = aLayer->GetCanvas();
+  nsCOMPtr<nsISerialEventTarget> target =
+      canvasElement->OwnerDoc()->EventTargetFor(TaskCategory::Other);
+
+  if (mLayers.Length() == 0) {
+    // WebXR uses a single layer for now.
+    RefPtr<VRLayerChild> vrLayer =
+        static_cast<VRLayerChild*>(manager->CreateVRLayer(
+            mDisplayClient->GetDisplayInfo().GetDisplayID(), target, mGroup));
+    mLayers.AppendElement(vrLayer);
+  }
+  RefPtr<VRLayerChild> vrLayer = mLayers[0];
+
+  Rect leftBounds(0.0, 0.0, 0.5, 1.0);
+  Rect rightBounds(0.5, 0.0, 0.5, 1.0);
+
+  vrLayer->Initialize(canvasElement, leftBounds, rightBounds);
+  vrLayer->SetXRFramebuffer(aLayer->GetFramebuffer());
+}
+
+uint32_t VRDisplayPresentation::GetGroup() const { return mGroup; }
+
+void VRDisplayPresentation::CreateLayers() {
+  VRManagerChild* manager = VRManagerChild::Get();
+  if (!manager) {
+    // This should not happen, but let's log it and avoid a crash in case
+    // of regression.
+    NS_WARNING("VRManagerChild::Get returned null!");
+    return;
+  }
+
+  unsigned int iLayer = 0;
+  for (dom::VRLayer& layer : mDOMLayers) {
+    dom::HTMLCanvasElement* canvasElement = layer.mSource;
+    if (!canvasElement) {
+      /// XXX In the future we will support WebVR in WebWorkers here
+      continue;
+    }
+
+    Rect leftBounds(0.0, 0.0, 0.5, 1.0);
+    if (layer.mLeftBounds.Length() == 4) {
+      leftBounds.SetRect(layer.mLeftBounds[0], layer.mLeftBounds[1],
+                         layer.mLeftBounds[2], layer.mLeftBounds[3]);
+    } else if (layer.mLeftBounds.Length() != 0) {
+      /**
+       * We ignore layers with an incorrect number of values.
+       * In the future, VRDisplay.requestPresent may throw in
+       * this case.  See https://github.com/w3c/webvr/issues/71
+       */
+      continue;
+    }
+
+    Rect rightBounds(0.5, 0.0, 0.5, 1.0);
+    if (layer.mRightBounds.Length() == 4) {
+      rightBounds.SetRect(layer.mRightBounds[0], layer.mRightBounds[1],
+                          layer.mRightBounds[2], layer.mRightBounds[3]);
+    } else if (layer.mRightBounds.Length() != 0) {
+      /**
+       * We ignore layers with an incorrect number of values.
+       * In the future, VRDisplay.requestPresent may throw in
+       * this case.  See https://github.com/w3c/webvr/issues/71
+       */
+      continue;
+    }
+
+    nsCOMPtr<nsISerialEventTarget> target =
+        canvasElement->OwnerDoc()->EventTargetFor(TaskCategory::Other);
+
+    if (mLayers.Length() <= iLayer) {
+      // Not enough layers, let's add one
+      RefPtr<VRLayerChild> vrLayer =
+          static_cast<VRLayerChild*>(manager->CreateVRLayer(
+              mDisplayClient->GetDisplayInfo().GetDisplayID(), target, mGroup));
+      if (!vrLayer) {
+        NS_WARNING("CreateVRLayer returned null!");
+        continue;
+      }
+      vrLayer->Initialize(canvasElement, leftBounds, rightBounds);
+      mLayers.AppendElement(vrLayer);
+    } else {
+      // We already have a layer, let's update it
+      mLayers[iLayer]->Initialize(canvasElement, leftBounds, rightBounds);
+    }
+    iLayer++;
+  }
+
+  // Truncate any excess layers that weren't included in the updated list
+  mLayers.SetLength(iLayer);
+}
+
+void VRDisplayPresentation::DestroyLayers() {
+  for (VRLayerChild* layer : mLayers) {
+    if (layer->IsIPCOpen()) {
+      Unused << layer->SendDestroy();
+    }
+  }
+  mLayers.Clear();
+}
+
+void VRDisplayPresentation::GetDOMLayers(nsTArray<dom::VRLayer>& result) {
+  result = mDOMLayers.Clone();
+}
+
+VRDisplayPresentation::~VRDisplayPresentation() {
+  DestroyLayers();
+  mDisplayClient->PresentationDestroyed();
+}
+
+void VRDisplayPresentation::SubmitFrame() {
+  for (VRLayerChild* layer : mLayers) {
+    layer->SubmitFrame(mDisplayClient->GetDisplayInfo());
+    break;  // Currently only one layer supported, submit only the first
+  }
+}